/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ==================== CSS变量定义 ==================== */
:root {
    /* 主色调 */
    --primary-color: #4361ee;
    --primary-dark: #3a0ca3;
    --primary-light: #7b8cff;
    
    /* 背景色 */
    --bg-gradient-start: #f0f4f8;
    --bg-gradient-end: #dfe8f7;
    --card-bg: rgba(255, 255, 255, 0.7);
    
    /* 文字颜色 */
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #999;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(67, 97, 238, 0.08);
    --shadow-md: 0 4px 20px rgba(67, 97, 238, 0.12);
    --shadow-lg: 0 8px 30px rgba(67, 97, 238, 0.15);
    --shadow-hover: 0 12px 40px rgba(67, 97, 238, 0.2);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* ==================== 基础样式 ==================== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 动态背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(67, 97, 238, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(123, 140, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ==================== 容器 ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-wrapper {
    animation: fadeIn 0.8s ease-out;
}

/* ==================== 动画定义 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 滚动动画元素 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 头部 ==================== */
.header {
    text-align: center;
    padding: 40px 0;
    border-bottom: 1px solid rgba(67, 97, 238, 0.1);
    position: relative;
}

.header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.logo {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    margin-bottom: 10px;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.logo i {
    margin-right: 10px;
    color: var(--primary-dark);
    animation: float 3s ease-in-out infinite;
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 1px;
}

/* ==================== 主要内容 ==================== */
.main-content {
    flex: 1;
    padding: 40px 0;
}

/* ==================== 英雄区域 ==================== */
.hero {
    text-align: center;
    margin-bottom: 60px;
    padding: 50px 40px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--primary-color));
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 20px;
    color: var(--primary-color);
    letter-spacing: 2px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ==================== 特性卡片 ==================== */
.features {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
}

.feature-card {
    flex: 1;
    min-width: 280px;
    text-align: center;
    padding: 45px 30px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(67, 97, 238, 0.2);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 25px;
    color: var(--primary-color);
    display: inline-block;
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    color: var(--primary-dark);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 15px;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.feature-card p {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ==================== 底部 ==================== */
.footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid rgba(67, 97, 238, 0.1);
    margin-top: 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.copyright,
.beian {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 5px 0;
}

.beian {
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.beian a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.beian a:hover {
    color: var(--primary-color);
}

/* ==================== 技术交流联系方式 ==================== */
.contact-section {
    position: relative;
    display: inline-block;
    margin: 15px 0;
}

.contact-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 25px;
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(123, 140, 255, 0.1));
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(67, 97, 238, 0.2);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.contact-trigger:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-trigger:hover span {
    color: white;
}

.contact-trigger:active {
    transform: translateY(0);
}

.contact-trigger i {
    transition: transform var(--transition-normal);
}

.contact-trigger:hover i {
    transform: rotate(10deg) scale(1.1);
}

/* ==================== 二维码弹出框 ==================== */
.qr-popup {
    position: absolute;
    bottom: calc(100% + 20px);
    left: 50%;
    transform: translateX(-50%) scale(0.8);
    transform-origin: bottom center;
    background: white;
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    z-index: 1000;
    min-width: 300px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    border: 1px solid rgba(67, 97, 238, 0.1);
}

.qr-popup.show {
    transform: translateX(-50%) scale(1);
    opacity: 1;
    visibility: visible;
}

.qr-code {
    width: 250px;
    height: auto;
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border: 1px solid rgba(67, 97, 238, 0.1);
    border-radius: var(--radius-sm);
    padding: 10px;
    background: white;
    transition: transform var(--transition-normal);
}

.qr-popup.show .qr-code {
    animation: pulse 2s ease-in-out infinite;
}

/* 箭头效果 */
.qr-popup::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -10px;
    border-width: 10px;
    border-style: solid;
    border-color: white transparent transparent transparent;
    filter: drop-shadow(0 2px 4px rgba(67, 97, 238, 0.1));
}

.beian-icon {
    vertical-align: middle;
    margin-right: 5px;
    width: 20px;
    height: 20px;
    display: inline-block;
}

/* ==================== 响应式设计 ==================== */

/* 平板设备 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header {
        padding: 30px 0;
    }

    .logo {
        font-size: 2rem;
        letter-spacing: 3px;
    }

    .main-content {
        padding: 30px 0;
    }

    .hero {
        padding: 35px 25px;
        margin-bottom: 40px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .features {
        flex-direction: column;
        gap: 20px;
    }

    .feature-card {
        min-width: 100%;
        padding: 35px 25px;
    }

    .feature-icon {
        font-size: 2.5rem;
    }

    .feature-card h3 {
        font-size: 1.4rem;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 25px 0;
    }

    .logo {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }

    .logo i {
        font-size: 1.6rem;
    }

    .tagline {
        font-size: 0.95rem;
    }

    .main-content {
        padding: 25px 0;
    }

    .hero {
        padding: 30px 20px;
        margin-bottom: 30px;
    }

    .hero-title {
        font-size: 1.5rem;
        letter-spacing: 1px;
    }

    .hero-description {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .features {
        gap: 15px;
    }

    .feature-card {
        padding: 25px 20px;
    }

    .feature-icon {
        font-size: 2rem;
        margin-bottom: 20px;
    }

    .feature-card h3 {
        font-size: 1.2rem;
        margin-bottom: 12px;
    }

    .feature-card p {
        font-size: 0.9rem;
    }

    .footer {
        padding: 25px 0;
        margin-top: 30px;
    }

    .copyright,
    .beian {
        font-size: 0.8rem;
    }

    .beian-icon {
        width: 16px;
        height: 16px;
    }

    .contact-trigger {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    .qr-popup {
        min-width: 260px;
        padding: 15px;
        left: 50%;
        transform: translateX(-50%) scale(0.8);
    }
    
    .qr-popup.show {
        transform: translateX(-50%) scale(1);
    }
    
    .qr-code {
        width: 200px;
        max-width: 85vw;
        max-height: 300px;
    }
}

/* 更小屏幕适配 */
@media (max-width: 360px) {
    .container {
        padding: 8px;
    }

    .logo {
        font-size: 1.5rem;
    }

    .hero {
        padding: 25px 15px;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .feature-card {
        padding: 20px 15px;
    }

    .feature-card h3 {
        font-size: 1.1rem;
    }

    .qr-popup {
        min-width: 220px;
        padding: 12px;
    }
    
    .qr-code {
        width: 180px;
        max-width: 80vw;
        max-height: 280px;
    }

    .beian-icon {
        width: 14px;
        height: 14px;
    }
}

/* 大屏幕设备 */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
        padding: 30px;
    }

    .header {
        padding: 60px 0;
    }

    .logo {
        font-size: 3rem;
        letter-spacing: 5px;
    }

    .tagline {
        font-size: 1.3rem;
    }

    .main-content {
        padding: 60px 0;
    }

    .hero {
        padding: 60px 50px;
        margin-bottom: 80px;
    }

    .hero-title {
        font-size: 2.8rem;
        letter-spacing: 3px;
    }

    .hero-description {
        font-size: 1.3rem;
    }

    .features {
        gap: 40px;
    }

    .feature-card {
        padding: 55px 35px;
        min-width: 320px;
    }

    .feature-icon {
        font-size: 3.5rem;
        margin-bottom: 30px;
    }

    .feature-card h3 {
        font-size: 1.8rem;
        margin-bottom: 18px;
    }

    .feature-card p {
        font-size: 1.1rem;
    }

    .footer {
        padding: 50px 0;
        margin-top: 60px;
    }

    .copyright,
    .beian {
        font-size: 1rem;
    }

    .beian-icon {
        width: 24px;
        height: 24px;
    }
}

/* ==================== 性能优化 ==================== */

/* GPU加速 */
.feature-card,
.contact-trigger,
.qr-popup,
.feature-icon,
.logo i {
    will-change: transform;
}

/* 减少重绘 */
.animate-on-scroll,
.feature-card,
.contact-trigger {
    backface-visibility: hidden;
    perspective: 1000px;
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .feature-card:hover {
        transform: none;
    }
    
    .feature-card:active {
        transform: scale(0.98);
    }
    
    .contact-trigger:hover {
        transform: none;
    }
    
    .contact-trigger:active {
        transform: scale(0.95);
    }
}

/* 打印样式 */
@media print {
    body {
        background: white;
    }
    
    .qr-popup,
    .contact-section {
        display: none;
    }
    
    .feature-card {
        break-inside: avoid;
    }
}